:root {
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --bg-color: #0f0f13;
    --card-bg: #1a1a22;
    --card-header: #24242e;
    --text-primary: #f1f1f3;
    --text-secondary: #a1a1aa;
    --border-color: #2e2e3a;
    --input-bg: #16161d;
    --error-color: #ef4444;
    --success-color: #10b981;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.app-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 10px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 10px;
    color: white;
}

.logo-icon i {
    font-size: 24px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Tab Navigation */
.tab-container {
    display: flex;
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 6px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab i {
    font-size: 20px;
}

.tab.active {
    background-color: var(--primary-color);
    color: white;
}

.tab:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Card Styles */
.card {
    background-color: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 24px;
    background-color: var(--card-header);
    border-bottom: 1px solid var(--border-color);
}

.card-header i {
    color: var(--primary-color);
    font-size: 22px;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Textarea */
.textarea-container {
    position: relative;
    width: 100%;
}

textarea {
    width: 100%;
    min-height: 200px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    color: var(--text-primary);
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.2s ease;
    line-height: 1.5;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn i {
    font-size: 20px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--card-header);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #2d2d3a;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    background-color: var(--card-header);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background-color: #2d2d3a;
}

/* Code Input */
.code-input-container {
    width: 100%;
}

#code-input {
    width: 100%;
    padding: 16px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1.2rem;
    text-align: center;
    letter-spacing: 8px;
    transition: border-color 0.2s ease;
}

#code-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Result Container */
.result-container {
    display: none;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    background-color: var(--card-header);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.code-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.code {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 4px;
}

.expiry-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.retrieved-header {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.retrieved-text {
    padding: 16px;
    background-color: var(--input-bg);
    border-radius: 8px;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Message Styles */
.message {
    display: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 0.9rem;
}

.message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.message.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

/* Loader */
.loader {
    display: none;
    justify-content: center;
    align-items: center;
}

.loader svg {
    width: 40px;
    height: 40px;
    animation: rotate 2s linear infinite;
}

.loader circle {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 4;
    stroke-dasharray: 125;
    stroke-dashoffset: 125;
    animation: dash 1.5s ease-in-out infinite;
}

@keyframes rotate {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes dash {
    0% {
        stroke-dashoffset: 125;
    }
    50% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: -125;
    }
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 0;
    }
    
    .card-body {
        padding: 20px 16px;
    }
    
    .code {
        font-size: 2rem;
    }
    
    .btn {
        padding: 12px 20px;
    }
}